It is just a variant of init_db. A more correct solution would be to
support configuring a different initdb command while passing values from
the pillar by default like version. This would make it truly generic but
is probably not achievable given current pillar self-referencing
capabilities (ie. none).
Thus, I decided to make it OS family specific since Debian provides its
own tools to manage clusters, etc. Gentoo also has a specific way to
initialize a new cluster which does not fit with commands.initdb so
the current if/elif would be extended when support is added for Gentoo.
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